An extensive empire must be supported by a refined system of policy and oppression; in the centre, an absolute power, prompt in action and rich in resources; a swift and easy communication with the extreme parts; fortifications to check the first effort of rebellion; a regular administration to protect and punish; and a well-disciplined army to inspire fear, without provoking discontent and despair.

The History Of The Decline And Fall Of The Roman Empire... The Second Edition (ed. 1788)